(i)One kg of water at 273 K is brought into contact with a heat reservoir at 373 K. When the water has reached 373 K, find the entropy change of the water of the heat reservoir and of the universe. (ii) If water is heated from 273 K to 373 K by first bringing it in contact with a reservoir at 323 K and then with a reservoir at 373 K, what will the entropy change of the universe be ?

(2) [ Describe briefly why the following statements are wrong. (i) "Hot cup of coffee becoming cold spontaneously is an entropy-decreasing process. So the law of entropy increase is violated in this situation." (ii) "Air conditioners require bulky external unit, exhausting heat to outside. With the technology constantly advancing, external unit will be eliminated in the future."

(a) In a crash test, two midsize cars travel directly toward each other, each moving at a speed of 25.0 m/s. They collide head-on and stick together. Both have a mass of 1.80 x 10³ kg. The air surrounding the two cars has a temperature of 25°C. What is the change in entropy (in J/K) of the air surrounding the two cars as a result of the collision? (Ignore any energy carried away from the collision by sound. Assume the time it takes for the internal energy to dissipate as heat is negligible.) J/K (b) What If? A car with the same mass and moving with the same speed as above collides head-on with a bus, also moving at the same speed, but with a mass of 7.20 x 10³ kg. The two vehicles stick together after the collision. What is the change in entropy (in J/K) of the surrounding air immediately after the collision? J/K (c) For the collision in part (b), what is the change in entropy (in J/K) of the surrounding air from the point just after the collision to the point where the combined…